Sodium Dodecyl Sulfonate Research Articles

Pipeline for precise insoluble matrisome coverage in tissue extracellular matrices.

The extracellular matrix (ECM) is assembled by hundreds of proteins orchestrating tissue patterning and surrounding cell fates via the mechanical-biochemical feedback loop. Aberrant ECM protein production or assembly usually creates pathological niches eliciting lesions that mainly involve fibrogenesis and carcinogenesis. Yet, our current knowledge about the pathophysiological ECM compositions and alterations in healthy or diseased tissues is limited since the methodology for precise insoluble matrisome coverage in the ECM is a "bottleneck." Our current study proposes an enhanced sodium dodecyl sulfonate (E-SDS) workflow for thorough tissue decellularization and an intact pipeline for the accurate identification and quantification of highly insoluble ECM matrisome proteins. We tested this pipeline in nine mouse organs and highlighted the full landscape of insoluble matrisome proteins in the decellularized ECM (dECM) scaffolds. Typical experimental validations and mass spectrometry (MS) analysis confirmed very little contamination of cellular debris remaining in the dECM scaffolds. Our current study will provide a low-cost, simple, reliable, and effective pipeline for tissue insoluble matrisome analysis in the quest to comprehend ECM discovery proteomic studies.

An environment-friendly and highly effective inhibitor for flotation separation of brucite and dolomite in SDS system

ABSTRACT Brucite is a type of mineral resource containing structural water and high contents of Mg, and is popular in refractory and flame-retardant materials. Dolomite is a common mineral associated with brucite, and its presence reduces the purity of brucite and utilization efficiency of resources. Therefore, in the flotation system of sodium dodecyl sulfonate, the selective inhibition characteristic and inhibition mechanism of environment-friendly and highly effective inhibitor sodium alginate (SA) on dolomite in the flotation separation of brucite and dolomite were investigated. The flotation test shows that an SA dosage of 8 mg/L can achieve 77.92% difference in floatability between brucite and dolomite, and the flotation effect was verified using the selectivity index. The measurement of contact angle shows the stability of the SA effect, thereby demonstrating significant SA effect on dolomite and a small effect on brucite. Zeta potential detection and infrared spectrum analysis show that the adsorption capacity between SA and dolomite is considerably stronger than that between SA and brucite, which is another critical reason for the inhibition of SA on dolomite flotation. In addition, the interaction of SA with the two minerals and the reasons for its selective interaction with dolomite were analyzed using X-ray photoelectron spectroscopic detection. SA shows strong interaction with Ca sites and the O in the carboxyl group of the SA structure can chelate Ca.

Salinity resistance of hydrophilic SiO2/SDS dispersions for foam stability and oil flooding effect: experiments and dynamics simulations

The foam performance of hydrophilic nanoparticles SiO2/SDS (Sodium Dodecyl Sulfonate) foam about temperature and salinity had been assessed by experiments. The concentration of Na+, Ca2+, and Mg2+ ions on foaming volume and foam half-life were verified, and the mixing dispersions with Na+, Ca2+, and Mg2+ concentration of 8:1:1 was researched the IFT, elastic modulus and foam strength by FoamScan for plugging ability. The mixing dispersions of no salinity and Na+, Ca2+, and Mg2+ of 8:1:1 were used to verify the salinity effects on foam properties by building hydrophilic SiO2 nanoparticles at the Gas-liquid interface. The flooding ability of two different foam dispersions was compared to enhance oil recovery. The flooding ability of two surfactant dispersions to oil molecules was verified by building the oil flooding models. In conclusion, the best foam performance condition was 30°Cand the sensitivity to hydrophilic SiO2/SDS dispersions could be summed up as: Ca2+> Mg2+ > Na+, hydrophilic SiO2/SDS foam dispersions with Na+, Ca2+, Mg2+ concentration of 8:1:1 had better foam stability and plugging ability at the salinity of 7.5 × 104∼12.5 × 104mg/L. The oil recovery increased from 53.62% to 68.54%, and simulation results showed that the removal of oil molecules was more efficient in mixed dispersions.

Preparation of Amphiphilic Solid Phase Extraction Material and Its Application in Aqueous Steroid Hormones Extraction

The steroid hormones have attracted increasing attentions in aquatic environment because of their endocrine disrupting effects at trace concentrations. In this work, amphiphilic solid phase extraction material of divinylbenzene-N-vinyl-2-pyrrolidinone polymer microsphere was synthesized by free radical polymerization. The adsorption of 4 steroid hormones in aqueous solution by prepared amphiphilic microsphere was determined by high-performance liquid chromatography-tandem mass spectrometry method. When methyl cellulose and sodium dodecyl sulfonate were used as dispersants, 2,2’-azobis(2-methylpropionitrile) was used as initiator, the amphiphilic microsphere was successfully prepared at 80 °C for 6 h. The amphiphilic microsphere has high specific surface area of 774 m2 g−1 with uniform particle size, which is comparable to the commercial solid phase extraction fillers. The amphiphilic microsphere has been successfully applied to the enrichment and detection of 4 steroid hormones (17α-hydroxyprogesterone, metandienone, norethindrone and boldenone) in natural water. The recoveries of 4 steroid hormones ranged from 83.7 % to 114 %, and the limit of detection were in the range of 0.70–13.5 ng L−1.

Surfactant-Tunable Nanoparticle Assembly via a Template-Directed Strategy

Nanoparticle (NP) self-assembly from suspension evaporation has been a topic of interest in recent times to fabricate a solid-state structure with diverse functions. We present a simple and facile evaporation-induced strategy for the formation of NP arrays on a flat substrate utilizing a template-directed sandwich system. The lithographic features assist the assembly of the typical nanoparticles (NPs), including SiO2, QDs@PS FMs, and QDs, on the top into circle, stripe, triangle, or square geometries with a fixed width of 2 μm. Additionally, an anionic surfactant, sodium dodecyl sulfonate (SDS), is incorporated into a negatively charged, hydrophilic SiO2 dispersion to govern the aggregation and self-assembly of NPs, fine tuning the morphologies of the residual structures on the substrate. SDS is attributed to modify the nature of SiO2 NPs to be hydrophobic, increase the hydrophobic attraction, dominating particle-particle and particle-interface interactions, and strengthen the particle-particle repulsive electrostatic force that results in the reduction of SiO2 NPs trapped in the separated colloidal suspension drop. Thus, using the SDS surfactant with the concentration ranging from 0 to 1 wt %, the obtained well-ordered SiO2 NP pattern packing on the substrate varies from six layers to one layer.

Study on the inhibition mechanism of guar gum in the flotation separation of brucite and dolomite in the presence of SDS

To solve the difficulty in efficient utilization of high-calcium brucite resources, this study focused on the basic research of flotation separation of dolomite from brucite using a selective regulator, namely, guar gum (GG). The flotation tests showed that the floatability of the two minerals was similar in a sodium dodecyl sulfonate (SDS) system. Simultaneously, the use of regulator GG inhibited the floating of dolomite but did not affect the floatability of brucite. The contact-angle measurement visually showed that brucite was relatively higher than dolomite in terms of floatability after the GG action. Zeta-potential measurements demonstrated that GG was more strongly adsorbed on the dolomite surface but less strongly adsorbed on the brucite surface. The infrared-spectrum analysis indicated that GG acted on the surface of the dolomite and hindered the adsorption of SDS on the dolomite surface. However, the opposite was true for brucite. The X-ray photoelectron spectroscopy detection further proved that GG was mainly bound to the Ca sites on the surface of the two minerals, whereas its binding ability to Mg sites was weak.

Treatment of surfactant wastewater by foam separation: Combining the RSM method and WOA-BP neural network to explore optimal process conditions

In the field of water treatment, the treatment of wastewater containing surfactants has been an important issue. The foam separation technique is often used to separate surfactants from water as a simple and efficient separation technique. We used a newly designed foam separation column to treat wastewater containing sodium dodecyl sulfonate (SDS) (0.5–2.0 mmol/L). The effects of initial SDS concentration (CSDS, i), operation time (t), foam height (H), gas velocity (V) and pH value (1−7) on the separation effect of SDS were investigated. The Box-Behnken design model was used to design the experimental group, and the process parameters of foam separation were optimized by combining response surface methodology (RSM) and WOA-BP neural network. The results showed that the prediction accuracy of the optimized BP neural network using the WOA algorithm was superior to that of the RSM model. The best operating parameters were: CSDS,i (0.88 mmol/L), t (28.13 min), H( 81.3 cm), V (1.03 L/min) and pH (3.5) and the recovery rate of SDS was up to 97.32%.

Investigation of bacteria and detergent residues on undergraduate students' dinner plates in dormitories during university lockdown.

The COVID-19 outbreak has disrupted undergraduate students' experiments since their access to the laboratory is limited. To address this problem, the bacteria and detergent residues on undergraduate students' dinner plates were investigated by the students in the dormitories. Five different types of dinner plates from 50 students were collected, which were cleaned with detergent and water in the same way and naturally dried. Then, Escherichia coli (E. coli) test papers and sodium dodecyl sulfonate test kits were used to understand the bacteria and detergent residuals. Commonly available equipment such as a yogurt maker was used for bacterial culture; detergent analyses were performed using centrifugation tubes. Effective sterilization methods and safety protection were achieved by dormitory available methods. According to the investigated results, the students found the differences in bacteria and detergent residuals between different dinner plates and made suitable choices for the future.

Enhanced oxidation aging resistance of asphalt binder with slow-release porous calcium carbonate microspheres loaded with asphalt rejuvenator

To enhance the oxidation aging resistance of asphalt binder, slow-release porous calcium carbonate (CaCO3) microspheres loaded with asphalt rejuvenator were proposed. The porous calcium carbonate microspheres fabricated by a double decomposition method regulated by polyacrylic acid (PAA) and sodium dodecyl sulfonate (SDS) were used as carriers for the asphalt rejuvenator. The test results showed that the porous CaCO3 microspheres possessed higher specific surface areas and porosities, and the weight ratio of the rejuvenator loaded on the CaCO3 microspheres was up to15%. Frequency sweep test results showed that the complex modulus of the asphalt binder added with rejuvenator-loaded CaCO3 microspheres decreased after aging. When the content of the CaCO3 microspheres added in asphalt binder reached 70%, the complex modulus is even less than that of neat asphalt. Additionally, the slow-release mechanism of the CaCO3 microspheres loaded with rejuvenator was studied based on molecular dynamics simulations. The simulation results also showed that the composition and structure of the molecule played an important role in the diffusion ability. This study provides a reference for developing a new method to delay the oxidation aging of asphalt, and it provides theoretical and experimental data support for the design of oxidation-aging resistance asphalt mixtures.

Insights into the synergistic adsorption mechanism of mixed SDS/DDA collectors on biotite using quartz crystal microbalance with dissipation

Biotite is critical in numerous fields. The conventional magnetic separation method has many disadvantages. Herein, the flotation behaviors and mechanisms of sodium dodecylsulfonate (SDS)/dodecylamine (DDA) collectors on the biotite surface were investigated systematically by various characterizations, including surface tension measurement, fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) analyses, and quartz crystal microbalance with dissipation (QCM-D). Micro-flotation experiments showed that the recovery of biotite increased to above 90 % upon adding mixed SDS/DDA collectors under the concentration of 5 × 10−4 mol/L with a molar ratio of 5:1 at alkaline pH (10–11), while that of quartz was below 10 %. The surface tension tests showed that the mixed collectors were easier to absorb on interface due to a strong synergistic effect. The FTIR and XPS measurements indicated that DDA was absorbed on biotite through electrostatic attraction and hydrogen bonds, and SDS could be co-adsorbed by the interaction with DDA and the electrostatic attraction with metal ions of the biotite. The QCM-D data revealed that a rigid and thin adsorption film formed when DDA reacted with the biotite surface. After continuing to inject SDS, a rigid and compact multilayer was generated.

Preparation of Copper Ion Adsorbed Modified Montmorillonite/Cellulose Acetate Porous Composite Fiber Membrane by Centrifugal Spinning.

The natural adsorption material montmorillonite (MMT) was selected, and cellulose acetate (CA) was used as the loading substrate to design and prepare a kind of green and environment-friendly recyclable porous composite fiber membrane with good heavy metal ion adsorption performance. Acetic acid modified montmorillonite (HCl-MMT), sodium dodecyl sulfonate modified montmorillonite (SDS-MMT), and chitosan modified montmorillonite (CTS-MMT) were prepared by inorganic modification and organic modification, and the porous MMT/CA composite fiber membrane was constructed by centrifugal spinning equipment. The morphological and structural changes of MMT before and after modification and their effects on porous composite fiber membranes were investigated. The morphology, structure, and adsorption properties of the composite fibers were characterized by scanning electron microscopy (SEM) and atomic absorption spectrometry (ASS). The experimental results showed that the maximum adsorption capacity of Cu2+ on the prepared 5 wt% CTS-MMT composite fiber membrane was 60.272 mg/g after 10 h static adsorption. The adsorption of Cu2+ by a porous composite fiber membrane conforms to the quasi-second-order kinetic model and Langmuir isothermal adsorption model. The main factor of the Cu2+ adsorption rate is chemical adsorption, and the adsorption mechanism is mainly monolayer adsorption.

Spreading Behavior and Wetting Characteristics of Anionic Surfactant Droplets Impacting Bituminous Coal.

Spraying water-based materials on the coal surface is a common means of coal dust suppression. There are obvious dynamic wetting behaviors during droplets impacting coal. To explore the spreading behavior and wetting characteristics of anionic surfactant droplets on bituminous coal, three anionic surfactants, which are sodium dodecyl sulfate (SDS), sodium dodecyl sulfonate (SDDS), and sodium dodecyl benzene sulfonate (SDBS), were used for the droplet impact experiment and molecular dynamics (MD) simulation. The results show that the addition of anionic surfactants can promote the wetting behavior of the droplet, and the difference between the head group and the tail group of the surfactant molecules can affect the wettability of the droplet. The dimensionless spreading coefficient shows the rule of SDBS > SDS > SDDS. When the concentration does not reach critical micelle concentration (CMC), the surface tension decreases and the dimensionless spreading coefficient of droplets increases with the increase of concentration. When the droplet concentration reaches the CMC, surface tension is no longer an effective indicator to evaluate the wettability of droplets. The dimensionless spreading coefficient can effectively evaluate the macroscopic spreading wetting behavior of droplets, and it is better than the surface tension. MD simulation results show that the interaction between anionic surfactants and coal molecules can affect the adsorption behavior, and the interaction energy and adhesion work are shown as the rule of SDBS < SDS < SDDS. The results of MD simulation and the impact experiment show that the intermolecular adsorption behavior has a significant influence on the spreading process. The results of MD simulation further explain the results of the droplet impact experiment.

The influence of the addition of sodium dodecyl sulfonate to sodium caprylate on the corrosion inhibition of carbon steel in aqueous HCl

The influence of the addition of sodium dodecyl sulfonate to sodium caprylate on the corrosion inhibition of carbon steel in aqueous HCl

Molecular dynamics simulations of the structure–property relationships of DDA/anionic surfactant mixtures at the air/water interface

In this study, three anionic surfactants (sodium oleate (NaOl), sodium dodecyl sulfonate (SDS) and naphthenic acid (NA)) were combined with dodecylamine (DDA) with molar ratios of 1:1 to investigate the interfacial behaviors of DDA/anionic surfactant mixtures at the air/water interface. The self-assembly processes and dynamic properties of the monolayers were then clarified by using molecular dynamics simulations to explore the effects of surfactant structure on surface activity. Compared with the pure DDA system, the mixtures that were oriented more perpendicularly at the air/water interface and had thicker hydrophilic films exhibited reduced surface tensions and improved hydrophobicity. The interactions between polar groups of the anionic surfactants and DDA reduced the electrostatic repulsions between DDA cations and increased the adsorption capacities of the mixtures at the air/water interface. The molecular dynamics simulations showed that different DDA/anionic surfactant mixtures had different surface activities. Due to the strong electronegativity of the sulfonic group, the interactions between SDS and DDA were the strongest, the amine groups showed a higher hydration degree, and the compatibility of the surfactant tails was better than those of the other anionic surfactants with DDA, which exhibited stronger synergistic effects. The simulation results were consistent with our previously reported data on flotation and surface tension, which may provide guidance for selection of collectors and foaming agents used in the flotation process.

Evaluation of 2-phosphatebutane-1, 2, 4-tricarboxylic acid as a depressant in the flotation separation of fluorite from barite

It is hard to separate barite from fluorite due to their similar surface properties. In this work, to achieve the separation of barite from fluorite, 2-phosphatebutane-1, 2, 4-tricarboxylic acid (PBTCA) was used to depress fluorite, and the floatability, separation efficiency and mechanism were researched by micro-flotation tests, zeta potential measurements, solution chemistry calculation and XPS analysis. Micro-flotation results showed that sodium dodecyl sulfonate (SDS) had an extremely good collecting capability for fluorite and barite, while PBTCA selectively depressed the floatability of fluorite and then allowed the recovery of barite. The flotation tests of artificial mineral mixtures showed that barite and fluorite can be effectively separated using PBTCA/SDS in a reasonable way. The zeta potential results indicated that PBTCA hindered the interaction of SDS with fluorite surface while had no influence on that for barite. The XPS analysis indicated that chemical interaction occurred between PBTCA and fluorite surface. Hence, it can be inferred PBTCA could be utilized as a promising depressant for the separation of fluorite from barite.

An embedded printed flexible strain resistance sensor via micro-structure design on graphene-filled conductive silicon rubber

Flexible strain sensors have been improved in sensing performance with the assistance of materials design, novel manufacturing, and microstructure fabrication. In this study, graphene was efficiently dispersed in ethanol and then re-dispersed into silicon rubber (SR) matrix, functioning as a flexible strain resistance sensor (FSRS) with functional macrostructure and modified microstructure to further improve the sensitivity. A stable dispersion of graphene was obtained in an ultrasound-aided ball milling process, where absolute ethanol was selected as the solvent and sodium dodecyl sulfonate as the surfactant. Graphene-filled conductive SR was embedded in the polydimethylsiloxane matrix as a conductive sensing layer, and the high sensing performance (GF = 25 ± 2) was achieved using a spiral printed. Micropores with an optimized interspacing of 10 mm were further introduced into the spiral CSM, and the results presented a significant improved sensitivity (GF = 51 ± 4) of the fabricated FSRS under a working strain (20%–30%) and cyclic test (>104 cycles). The FRSR was sensitive enough to monitor various movements of single and multi-joints of human body and identify the rhythm of music sound, which exhibited its potential application as a wearable flexible sensor.

Characterization and mechanism of aflatoxin degradation by a novel strain of Trichoderma reesei CGMCC3.5218.

Aflatoxins, which are produced mainly by Aspergillus flavus and A. parasiticus, are recognized as the most toxic mycotoxins, which are strongly carcinogenic and pose a serious threat to human and animal health. Therefore, strategies to degrade or eliminate aflatoxins in agro-products are urgently needed. We investigated 65 Trichoderma isolates belonging to 23 species for their aflatoxin B1 (AFB1)-degrading capabilities. Trichoderma reesei CGMCC3.5218 had the best performance, and degraded 100% of 50 ng/kg AFB1 within 3 days and 87.6% of 10 μg/kg AFB1 within 5 days in a liquid-medium system. CGMCC3.5218 degraded more than 85.0% of total aflatoxins (aflatoxin B1, B2, G1, and G2) at 108.2–2323.5 ng/kg in artificially and naturally contaminated peanut, maize, and feed within 7 days. Box–Behnken design and response surface methodology showed that the optimal degradation conditions for CGMCC3.5218 were pH 6.7 and 31.3°C for 5.1 days in liquid medium. Possible functional detoxification components were analyzed, indicating that the culture supernatant of CGMCC3.5218 could efficiently degrade AFB1 (500 ng/kg) with a ratio of 91.8%, compared with 19.5 and 8.9% by intracellular components and mycelial adsorption, respectively. The aflatoxin-degrading activity of the fermentation supernatant was sensitive to proteinase K and proteinase K plus sodium dodecyl sulfonate, but was stable at high temperatures, suggesting that thermostable enzymes or proteins in the fermentation supernatant played a major role in AFB1 degradation. Furthermore, toxicological experiments by a micronucleus assay in mouse bone marrow erythrocytes and by intraperitoneal injection and skin irritation tests in mice proved that the degradation products by CGMCC3.5218 were nontoxic. To the best of our knowledge, this is the first comprehensive study on Trichoderma aflatoxin detoxification, and the candidate strain T. reesei CGMCC3.5218 has high efficient and environment-friendly characteristics, and qualifies as a potential biological detoxifier for application in aflatoxin removal from contaminated feeds.

Quantitative investigation of nanofluid imbibition in tight oil reservoirs based on NMR technique

Nanofluids have been effective chemical additives for enhanced oil recovery (EOR) in tight oil reservoirs due to their special properties. However, oil imbibition recoveries vary for different nanofluids. The oil/water distribution in rocks during imbibition using various nanofluids was less discussed in previous studies. In this study, we systematically examined the imbibition efficiencies of various nanofluids at 60 °C. Furthermore, the migration of nanofluids and oil distribution in the rock pores were monitored using nuclear magnetic resonance (NMR). The nanofluids were prepared by dispersing silica nanoparticles and five different types of surfactants (i.e., anionic-nonionic, anionic, nonionic, amphoteric and cationic surfactants in deionized (DI) water. Subsequently, interfacial tension (IFT) and contact angle measurements were conducted to reveal the underlying EOR mechanisms of various nanofluids. The experimental results showed that the EOR potential of the different types of nanofluids was in the order anionic-nonionic > anionic > nonionic > amphoteric > cationic > brine. Anionic-nonionic (sodium lauryl ether sulfate (SLES)) and anionic (sodium dodecyl sulfonate (SDS)) nanofluids exhibited excellent capability of wettability alteration, and increased oil recovery by 27.96% and 23.08%, respectively, compared to brine. The NMR results also showed that mesopores (0.1–1 μm) were the dominant developed pores in the rocks, and contributed the most to imbibition efficiency. In addition, the imbibition of nanofluids initially took place in mesopores and micropores before moving into macropores. This study provides fundamental information on the selection of nanofluids for EOR in tight oil reservoirs. The study also improved the understanding of oil/water distribution during the imbibition of the proposed nanofluids.

Treating Oil Sludge by Microemulsion System Containing Sodium Dodecyl Sulfonate

Treating Oil Sludge by Microemulsion System Containing Sodium Dodecyl Sulfonate

Microbial Responses to Various Types of Chemical Regents during On-Line Cleaning of UF Membranes.

Ultrafiltration is widely used to treat various environmental waters, and on-line membrane cleaning with various chemical reagents is frequently employed to sustain the filtration flux. However, the residue of cleaning agents in the ultrafiltration system is unavoidable, which may affect microbiological properties and biofilm formation during the next-round filtration. By investigating the changes in microbial characteristics, and their biofouling behaviors after exposure to HCl, NaOH, NaClO, citric acid (CA), and sodium dodecyl sulfonate (SDS), this study fills a knowledge gap in microbial responses to various types of chemical cleaning agents in an ultrafiltration system. The result shows that HCl, NaOH, and NaClO affect the bacterial properties and subsequent attachment on the membrane surface, while CA and SDS have no obvious influence on microorganisms. Specifically, HCl, NaOH, and NaClO reduce the hydrophobicity and mean size of suspended microorganisms, increase the extracellular polymeric substances (EPS) release, and trigger intracellular reactive oxygen species (ROS) generation, resulting in the death of a large quantity of microorganisms. Due to the self-protecting strategy, plenty of living cells aggregate on the membrane surface and form a cake layer with a stratified structure, causing more severe membrane biofouling.